v3.26.1
Financial Statement Presentation New Accounting Pronouncement Adopted (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
agreement
Mar. 31, 2025
USD ($)
Mar. 01, 2026
USD ($)
$ / shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cash and Cash Equivalent $ 1,600     $ 1,382  
Restricted Cash and Cash Equivalent, Current 599     691  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 2,319 $ 2,566   2,162 $ 2,039
Accounts Receivable, Allowance for Credit Loss, Current 41     39  
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 12 13      
Accounts Receivable, Allowance for Credit Loss, Writeoff (9)        
Accounts and Financing Receivable, Allowance for Credit Loss 86 109   83 96
Additional Paid in Capital $ 5,885     5,904  
Obligations Number Of Agreements | agreement 58        
Guarantor Obligations, Maximum Exposure, Undiscounted $ 4,227        
Supplier Finance Program, Obligation 805     616  
Investment Tax Credit 190        
Proceeds Investment Tax Credits 414 75      
Restricted Cash And Debt Service Reserves 719     531  
Restricted Cash Held for Insurance $ 152     153  
Variable Interest Entity, Terms of Arrangements 1.5 billion        
Noncontrolling Interest in Variable Interest Entity $ 127        
Merger Agreement, Expected Consideration, Equity Interests Issued and Issuable, Cash Paid Per Acquiree Share | $ / shares     $ 15.00    
Secured Debt [Member] | Standby Letters of Credit [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Obligations Number Of Agreements | agreement 12        
Guarantor Obligations, Maximum Exposure, Undiscounted $ 328        
Accrued Liabilities          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Supplier Finance Program, Obligation 620     391  
Accrued Liabilities | Minimum [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Supplier Finance Program, Obligation 1     1  
Accrued Liabilities | Maximum [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Supplier Finance Program, Obligation 63     51  
Mong Duong Subsidiary [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Selling Expense   5      
Other Entity [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accounts Receivable, Allowance for Credit Loss, Current 6 29   $ 6 $ 29
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 0 $ 0      
Accounts Receivable, Allowance for Credit Loss, Writeoff $ 0        
Horizon Parent, L.P.          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Business Combination, Termination Fee     $ 100    
Business Combination, Approximate Termination Fee     588    
AES Corp          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Business Combination, Termination Fee     $ 321